docs: def wnintd(a, b):
      """
      Place the intersection of two double precision windows into
      a third window.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/wnintd_c.html
  
  
      :param a: Input window A. 
      :type a: spiceypy.utils.support_types.SpiceCell
      :param b: Input window B. 
      :type b: spiceypy.utils.support_types.SpiceCell
      :return: Intersection of a and b.
      :rtype: spiceypy.utils.support_types.SpiceCell
      """
      assert isinstance(a, stypes.SpiceCell)
      assert b.dtype == 1
      assert isinstance(b, stypes.SpiceCell)
      assert a.dtype == 1
      c = stypes.SpiceCell.double(b.size + a.size)
      libspice.wnintd_c(ctypes.byref(a), ctypes.byref(b), ctypes.byref(c))
      return c